A planar beam steerable array antenna system is proposed with dual-control circuits for feeding and reactive loadings. Two\northogonally arranged planar dipoles are excited by SPDT switching circuits, while the forward and backward beam directions\nare controlled by the adjusted effective electric lengths of the parasitic dipole elements. The adjusted parasitic dipoles are\ndesigned to play the alternative roles of directors and reflectors based on the Yagi-Uda antenna theory. The proposed antenna\nsystem with four-way switchable beams has been implemented on a planar substrate and evaluated for orthogonal four-way\nbeam steering performance with good agreement.
Loading....